---
title: "User Manual: BOM Additional Costs Management"
space: "Csf_tz_enhancements"
url: "https://support.aakvatech.com/bom_additional_costs_management"
updated: "2026-07-22"
---

## 1. Overview
This module enables tracking of additional costs associated with a Bill of Materials (BOM) in ERPNext. It helps in accurate cost management by allowing entry of cost types, per-unit costs, and related expense accounts, which can be seamlessly imported into related documents like Stock Entry.

## 2. Key Features
- Custom Child Table: **BOM Additional Costs**.
- Fields: Cost Type, Cost Per Unit, Expense Account.
- Editable Grid with list view support.
- JavaScript query filter for valid Expense Accounts.
- Import additional costs from BOM to Stock Entry via server-side script.

## 3. Pre-Requisites
- Active ERPNext system.
- BOM records with defined additional costs.
- Properly configured Chart of Accounts.
- User with necessary permissions.

## 4. Step-by-Step Usage
### In BOM DocType:
1. Navigate to the BOM form.
2. Under the "Additional Costs" table:
   - Enter **Cost Type** (e.g., Transport, Packaging).
   - Enter **Cost Per Unit**.
   - Select **Expense Account** (filtered by company and valid account types).
3. Save the BOM.

### In Stock Entry:
1. Create a Stock Entry with type **Manufacture**.
2. Set **BOM No.** and ensure stock entry type is correctly selected.
3. Call `import_from_bom` function (can be automated or triggered via custom button/script).
4. Review the imported additional costs.

## 5. Script Customizations
### JavaScript (BOM):
```javascript
frappe.ui.form.on("BOM", {
    refresh: function (frm) {
        frm.set_query("expense_account", "additional_costs", function () {
            return {
                filters: {
                    account_type: [
                        "in",
                        [
                            "Tax",
                            "Chargeable",
                            "Income Account",
                            "Expenses Included In Valuation",
                            "Expenses Included In Asset Valuation",
                        ],
                    ],
                    company: frm.doc.company,
                },
            };
        });
    },
});
```

### Python (Stock Entry):
```python
def import_from_bom(self, method):
    if self.stock_entry_type == "Manufacture" and self.bom_no:
        bom = frappe.get_doc("BOM", self.bom_no)
        for d in bom.additional_costs:
            self.append("additional_costs", {
                "expense_account": d.expense_account,
                "amount": d.cost_per_unit,
                "base_amount": d.cost_per_unit,
                "description": d.cost_type
            })
```

## 6. Troubleshooting (Common Errors and Resolutions)
| Error Message                                | Cause                                    | Resolution                                      |
|---------------------------------------------|------------------------------------------|-------------------------------------------------|
| "Expense Account not found or invalid."     | Account not in allowed types or company. | Ensure account is valid and meets filter rules. |
| "No BOM selected for Stock Entry."          | `bom_no` not set.                        | Set a valid BOM No. in Stock Entry.             |
| "No additional costs available in BOM."     | BOM lacks additional cost entries.       | Add additional costs in BOM before import.      |

## 7. User Roles and Permissions
- **System Manager**: Full access.
- **Stock User**: Read and update access.
- **Accounts Manager**: Can manage expense accounts.

## 8. Key Notes
- Ensure `additional_costs` table is correctly configured in both BOM and Stock Entry.
- Expense accounts must align with specified account types for filtering.
- Always validate entries before saving to avoid import errors.
- Custom buttons can be added for user-triggered import actions if required.